Power-hammer.



No. 802,319. PATENTED OCT. 17, 1905. O. B. REYNOLDS.

POWER HAMMER.

APPLICATION FILED MAY 28.1904.

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No. 802,319. PATENTED 001117, 1905. 0. B. REYNOLDS. POWER HAMMER.

APPLICATION FILED MAY 28.1904.

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POWER-"HAMMER" Specification of Letters Patent.

Patented Oct. 17, 1905.

Application filed May 28, 1904. Serial No. 210,220.

To all whom it may concern.-

Be it known that I, OLIVER B. REYNOLDS, a citizen of the United States, residing at Brockton, in the county of Plymouth and State of Massachusetts, have invented a new and useful Improvement in Power-Hammers, of which the following is a complete specification.

This invention relates to power-hammers of the type in which a reciprocating ram or hammer cooperates with a fixed anvil, and more particularly to the resilient, cushioned, or flexible connecting means which is usually interposed between the ram or hammer and the actuating mechanism therefor.

The principal object of the invention is to secure a long and hence an efl ective stroke of the ram, to cause the intermediary resilient connecting means to expand (or absorb) equal amounts of momentum in equal increments of space traversed in its path of flexure and to provide a variable movement in the stroke of the ram. The above I accomplish by regulating the movement of said ram through springs of a novel construction or a construc tion whereby they are made to offer a substantially uniform resistance in their fiexural movement.

Further subordinate objects will appear in the disclosure of this invention which has been embodied and illustrated in the accompanying drawings, in which Figure 1 is a front elevation of a powerhammer embodying my improvement. Fig. 2 is an enlarged detail view of the pitman or that portion of the above hammer which forms the cushioned or flexible connection between the ram and the driving member of the same and. which constitutes the essence of this invention. Fig. 3 is a side elevation of the adjustable pitman-head, a front view of which appears in Fig. 2, the wrist-pin sleeve and sleeve-block being shown in connection therewith. Fig. 4L is an elevation of the rear or contacting side of the sleeve-block for the pitman-head with the sleeve omitted, a front view of which appears in Fig. 1. Fig. 5 is a detail view of the wrist-pin sleeve. Fig. 6 is a reverse plan of one of the adjustable steps which prevent buckling of the inward members of the springs, and Fig. 7 is an enlarged detail of one of the arms by which longitudinal adjustment of said inner member is of fected.

Referring to the accompanying drawings, 1 designates the upright frame or stand of an ordinary power-hammer to the laterally-pro jecting portion 1 of which is secured the usual anvil-block 2. This anvil-block may be secured to the frame of the hammer in any desired manner, but is shown as passing through an opening in the flaring base 1 of said frame and as being secured to the portion 1 by the metallic straps 3 3. Secured on the upper face of the anvil-block 2 is the usual anvil at, which supports the lower die 5. Mounted upon a suitable shaft at the upper extremity of the main frame is the crankdisk 6.

7 designates the fly-wheel, and 8 the beltpulley mounted rigidly on the same shaft with the crank-disk.

8 is the belt, which passes around the beltpulley 8 and affords driving means for the hammer, and 9 is the idler-pulley, serving the usual function of such devices.

The crank-disk 6 is provided with a wrist pin 6', the connection of which with said disk may be of any of the ordinary adjustable forms; but as such features constitute no part of this invention further details of same may be omitted.

Suitably secured to the frame or stand of the hammer on the upper ln'acket-forming portion thereof are the guides 10 10, which form ways for the hammer or ram 11, the lateral flange projections 11 thereof engaging the corresponding ways in said guides in a manner well understood.

12 designates the upper die, carried by the ram.

No claim to novelty is made in any of the above-mentioned parts, and hence a mere reference to same will suffice, as they are of importance only in so far as they aid in illustrating the application of this improvement.

The novel element which will now be described lies in the cushioned or flexible connecting means or pitman connection interposed between the ram 11 and the crank-disk 6, which, with its adjunctive parts, (hereto fore mentionech) may be regarded as the driving member of the machine.

On the wrist-pin 6 is secured the sleeve 13, having the shoulder 13 near the disk end thereof. On this sleeve 13 journals the block 1 1, provided with two sets of laterally-arranged corrugations or teeth 14'. Shown in Fig. 2 in an enlarged detail front view is the pitman-head 15, provided with two sets of corrugations or teeth 15, corresponding to the sets 14' on the sleeve-block 1e. By means of these corrugations or toothed racks the pitman-head is secured in any desired position i way is substantially as in other power-hamto the block 14, which in turn is mounted on the wrist-pin sleeve 13, and in this manner an adjustable connection is effected between the said pitman-head and crank-disk 6. This pitman-head is preferably a casting, irregular in form and of rectangular cross-section, as shown, and having the longitudinally-extending centrally-located slot 16, adapted to receive the sleeve 13 on the wrist-pin of the crank-disk, the said slot permitting of relative adjustment between the two. Cored passages 17 areformed in each side of said casting and serve not only to lighten the same, but also afford passage-ways through which extend the inner spring-bars 18 of the springs 19. These spring-bars 18 are arranged to be upwardly convergent and are secured to the pitmanhead 15 by means of the cap-screws 20, which engage the slots 21 (see Fig. 3) in the upper ends of said members 18, the slots providing for longitudinal adjustment thereof. A bearing-plate 22 (shown in position in Fig. 2, but removed from the view shown in Fig. 3) is interposed between the heads of the cap-screws and the end of the spring-bars. The ribs 23, which form the walls of the cored passages 17, extend along and embrace the upper ends of the bars 18, as shown in Fig. 3, and prevent lateral movement thereof.

Secured to the sides of the pitman-head 15 by the cap-screws 24 and'downwardly convergent with respect to the spring-bars 18 are the coacting spring-bars 25. Bearing-plates 26, similar to the plates 22, strengthen the securement of the upper ends of said bars. The lower or free ends of these spring-bars 18 and 25 are rigidly secured together by the bolts 27, these bolts also supporting in position the outwardly-opening half-bearings 28. To prevent the inner spring-bars 18 from working upwardly, the arms 29 are placed as shown, the outer ends of which impinge the upper ends of said bars and by means of which, through the cap-screws 30, the spring-bars are brought and held in any desired position. Links 31 connect the lower ends of the springs 19 with the ram 11, the links engaging the half-bearings 28 on the springs and the pins 11 on the ram. A recess 11 is provided in the ram to receive the inner ends of said links.

To prevent the ram 11 in its upward movement from striking the pitman-head 15, a check-spring 32 is adjustably secured to the upper end of said ram by means of the yoke 33. This yoke is provided with slots 34, which permit of a vertical adjustment of said spring, the cap-screws 35 engaging said slots and securing the spring-yoke to the ram.

To prevent the spring-bar 18 from buckling inwardly, the stops 36 (see Figs. 2 and 6) are preferably provided, the slots 37 in said stops permitting of outward and inward adjustment of same.

The operation of the machine in a general mers. with the exception of the peculiar action of the springs which support and control the movement of the ram. hen the springs are in their normal position, or in the position shown by full lines in Fig. 2, the inner springbar 18 as long as it remains rigid operates as a brace for the outer bar 25, and hence a considerable inward force on the lower ends of the springs 19 will be required to start a defiection thereof. Before flexure can begin the inner bars 18 must be forced into contact with the bars 25 at their outer ends. The portion of the springs in contact operates simply as a two-.leaf spring, while the remainder of the inner bars act as a brace to support the outer one. As flexure of both bars continue the non-contacting portion or bracing portion of the inner bar progressively decreases in length, and hence its effectiveness decreases. In this way the spring 19, formed by the two bars 18 and 25, will offer a substantially uniform resistance throughout its path of flexure or will absorb (or expend) substantially equal amount of momentum in equal increments of space traversed in the path offlexure. In other words, substantially the same amount of energy is required to bend the springs through the first inch as through the last inch of flexure. The dotted lines in Fig. 2 indicate the relative positions of the inner and outer spring-bars when under stress.

This improvement is not intended to be limited to the particular construction shown, for the shape and proportion of the parts could be varied, more than two spring-bars could be used in each spring, and other modifications could be effected and yet come within the spirit and scope of this invention.

hat I claim as my invention, and desire to secure by Letters Patent, is

1. In a power-hammer, in combination, a ram, ram actuating mechanism, a pitmanhead, two pairs of springs rigidly secured to said pitman-head, the springs of each pair being arranged convergently toward and secured together at their free ends, and links connecting said free ends with said ram, substantially as and for the purpose set forth.

2. In a power-hammer, in combination, a ram, ram actuating mechanism, a pitmanhead, springs disposed in pairs and secured rigidly to said pitman-head, the springs of each pair being arranged convergently toward and secured together at their free ends, and links connecting said free ends with said ram, substantially as and for the purpose set forth.

3. In a power-hammer, in combination, a ram, ram-actuating mechanism, spring-supporting means operatively connected with said ram-actuating mechanism, springs disposed in pairs and secured rigidly to said spring-supporting means, the springs of each pair being arranged convergently toward and ram, ram actuating mechanism, a pitlnanhead, springs disposed in pairs and secured rigidly to said pitinan-head, the springs of each pair being arranged convergently toward and secured together at their free ends, links connecting said free ends with the ram, and a check-spring secured to the upper end of said ram and arranged to impinge the under side of said pitman-head, substantially as and for the purpose set forth.

OLIVER B. REYNOLDS. Witnesses:

MARGARET A. SWEENEY, J. C. WARNns. 

